EP 3590645 A4 20200325 - RESISTANCE SPOT WELDING METHOD
Title (en)
RESISTANCE SPOT WELDING METHOD
Title (de)
WIDERSTANDSPUNKTSCHWEISSVERFAHREN
Title (fr)
PROCÉDÉ DE SOUDAGE PAR POINTS PAR RÉSISTANCE
Publication
Application
Priority
- JP 2017038590 A 20170301
- JP 2018007809 W 20180301
Abstract (en)
[origin: EP3590645A1] Provided is a resistance spot welding method that can prevent the occurrence of cracking in the weld according to the angle of electrodes irrespective of the type of steel and can maintain the strength of the joint sufficiently. The resistance spot welding method for joining a sheet set including a plurality of lapped steel sheets includes: holding the sheet set between a pair of electrodes; and energizing the sheet set under application of electrode force to thereby join the steel sheets together. At least one of the plurality of lapped steel sheets is a surface-treated steel sheet including a metal coating layer on a surface thereof. The energizing includes: a primary energizing step of performing energization to form a nugget portion; a non-energizing step in which, after the primary energizing step, the energization is suspended for an energization suspension time Tc (cycles); and a secondary energizing step of, after the non-energizing step, performing energization for reheating while the nugget portion is prevented from growing. During the energizing, the relations of the following formula (I) are satisfied:22+A⋅B/100<Ip/Im<Cwhen0<A<3,17+A⋅B/80<Ip/Im<Cwhen3≤A<7,and11+A⋅B/60<Ip/Im<Cwhen7≤A<15,where A is an electrode misalignment angle (degrees) of the electrodes, Im is a current value (kA) in the primary energizing step, Ip is a current value (kA) in the secondary energizing step, B is a variable defined as 1 + 0.1·Tc, and C is a variable defined as 1 + 0.2·Tc.
IPC 8 full level
B23K 11/11 (2006.01); B23K 11/16 (2006.01); B23K 11/24 (2006.01)
CPC (source: EP KR US)
B23K 11/0026 (2013.01 - US); B23K 11/11 (2013.01 - EP); B23K 11/115 (2013.01 - EP KR US); B23K 11/16 (2013.01 - KR); B23K 11/163 (2013.01 - US); B23K 11/166 (2013.01 - EP); B23K 11/24 (2013.01 - EP KR); B23K 2103/04 (2018.07 - US)
Citation (search report)
- [X] JP 2016068142 A 20160509 - NIPPON STEEL & SUMITOMO METAL CORP
- [A] WO 2016181996 A1 20161117 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
- See references of WO 2018159764A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3590645 A1 20200108; EP 3590645 A4 20200325; CN 110325313 A 20191011; CN 110325313 B 20210723; KR 102197434 B1 20201231; KR 20190112045 A 20191002; MX 2019010321 A 20191021; WO 2018159764 A1 20180907
DOCDB simple family (application)
EP 18760585 A 20180301; CN 201880014171 A 20180301; JP 2018007809 W 20180301; KR 20197024833 A 20180301; MX 2019010321 A 20180301